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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: RequestVote.html 939 2015-05-29 01:16:17Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.kv.raft.msg;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.base.Preconditions;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.nio.ByteBuffer;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.jsimpledb.util.LongEncoder;<a name="line.14"></a>
<span class="sourceLineNo">015</span><a name="line.15"></a>
<span class="sourceLineNo">016</span>/**<a name="line.16"></a>
<span class="sourceLineNo">017</span> * Send from candidates to other nodes to request a vote during an election.<a name="line.17"></a>
<span class="sourceLineNo">018</span> */<a name="line.18"></a>
<span class="sourceLineNo">019</span>public class RequestVote extends Message {<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>    private final long lastLogTerm;<a name="line.21"></a>
<span class="sourceLineNo">022</span>    private final long lastLogIndex;<a name="line.22"></a>
<span class="sourceLineNo">023</span><a name="line.23"></a>
<span class="sourceLineNo">024</span>// Constructors<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>    /**<a name="line.26"></a>
<span class="sourceLineNo">027</span>     * Constructor.<a name="line.27"></a>
<span class="sourceLineNo">028</span>     *<a name="line.28"></a>
<span class="sourceLineNo">029</span>     * @param clusterId cluster ID<a name="line.29"></a>
<span class="sourceLineNo">030</span>     * @param senderId identity of sender<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * @param recipientId identity of recipient<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * @param term sender's current term<a name="line.32"></a>
<span class="sourceLineNo">033</span>     * @param lastLogTerm term of the sender's last log entry<a name="line.33"></a>
<span class="sourceLineNo">034</span>     * @param lastLogIndex index of the sender's last log entry<a name="line.34"></a>
<span class="sourceLineNo">035</span>     */<a name="line.35"></a>
<span class="sourceLineNo">036</span>    public RequestVote(int clusterId, String senderId, String recipientId, long term, long lastLogTerm, long lastLogIndex) {<a name="line.36"></a>
<span class="sourceLineNo">037</span>        super(Message.REQUEST_VOTE_TYPE, clusterId, senderId, recipientId, term);<a name="line.37"></a>
<span class="sourceLineNo">038</span>        this.lastLogTerm = lastLogTerm;<a name="line.38"></a>
<span class="sourceLineNo">039</span>        this.lastLogIndex = lastLogIndex;<a name="line.39"></a>
<span class="sourceLineNo">040</span>        this.checkArguments();<a name="line.40"></a>
<span class="sourceLineNo">041</span>    }<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>    RequestVote(ByteBuffer buf) {<a name="line.43"></a>
<span class="sourceLineNo">044</span>        super(Message.REQUEST_VOTE_TYPE, buf);<a name="line.44"></a>
<span class="sourceLineNo">045</span>        this.lastLogTerm = LongEncoder.read(buf);<a name="line.45"></a>
<span class="sourceLineNo">046</span>        this.lastLogIndex = LongEncoder.read(buf);<a name="line.46"></a>
<span class="sourceLineNo">047</span>        this.checkArguments();<a name="line.47"></a>
<span class="sourceLineNo">048</span>    }<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>    @Override<a name="line.50"></a>
<span class="sourceLineNo">051</span>    void checkArguments() {<a name="line.51"></a>
<span class="sourceLineNo">052</span>        super.checkArguments();<a name="line.52"></a>
<span class="sourceLineNo">053</span>        Preconditions.checkArgument(this.lastLogTerm &gt; 0);<a name="line.53"></a>
<span class="sourceLineNo">054</span>        Preconditions.checkArgument(this.lastLogIndex &gt; 0);<a name="line.54"></a>
<span class="sourceLineNo">055</span>    }<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>// Properties<a name="line.57"></a>
<span class="sourceLineNo">058</span><a name="line.58"></a>
<span class="sourceLineNo">059</span>    public long getLastLogTerm() {<a name="line.59"></a>
<span class="sourceLineNo">060</span>        return this.lastLogTerm;<a name="line.60"></a>
<span class="sourceLineNo">061</span>    }<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span>    public long getLastLogIndex() {<a name="line.63"></a>
<span class="sourceLineNo">064</span>        return this.lastLogIndex;<a name="line.64"></a>
<span class="sourceLineNo">065</span>    }<a name="line.65"></a>
<span class="sourceLineNo">066</span><a name="line.66"></a>
<span class="sourceLineNo">067</span>// Message<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span>    @Override<a name="line.69"></a>
<span class="sourceLineNo">070</span>    public void visit(MessageSwitch handler) {<a name="line.70"></a>
<span class="sourceLineNo">071</span>        handler.caseRequestVote(this);<a name="line.71"></a>
<span class="sourceLineNo">072</span>    }<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>    @Override<a name="line.74"></a>
<span class="sourceLineNo">075</span>    public void writeTo(ByteBuffer dest) {<a name="line.75"></a>
<span class="sourceLineNo">076</span>        super.writeTo(dest);<a name="line.76"></a>
<span class="sourceLineNo">077</span>        LongEncoder.write(dest, this.lastLogTerm);<a name="line.77"></a>
<span class="sourceLineNo">078</span>        LongEncoder.write(dest, this.lastLogIndex);<a name="line.78"></a>
<span class="sourceLineNo">079</span>    }<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>    @Override<a name="line.81"></a>
<span class="sourceLineNo">082</span>    protected int calculateSize() {<a name="line.82"></a>
<span class="sourceLineNo">083</span>        return super.calculateSize()<a name="line.83"></a>
<span class="sourceLineNo">084</span>          + LongEncoder.encodeLength(this.lastLogTerm)<a name="line.84"></a>
<span class="sourceLineNo">085</span>          + LongEncoder.encodeLength(this.lastLogIndex);<a name="line.85"></a>
<span class="sourceLineNo">086</span>    }<a name="line.86"></a>
<span class="sourceLineNo">087</span><a name="line.87"></a>
<span class="sourceLineNo">088</span>// Object<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>    @Override<a name="line.90"></a>
<span class="sourceLineNo">091</span>    public String toString() {<a name="line.91"></a>
<span class="sourceLineNo">092</span>        return this.getClass().getSimpleName()<a name="line.92"></a>
<span class="sourceLineNo">093</span>          + "[\"" + this.getSenderId() + "\"-&gt;\"" + this.getRecipientId() + "\""<a name="line.93"></a>
<span class="sourceLineNo">094</span>          + ",clusterId=" + String.format("%08x", this.getClusterId())<a name="line.94"></a>
<span class="sourceLineNo">095</span>          + ",term=" + this.getTerm()<a name="line.95"></a>
<span class="sourceLineNo">096</span>          + ",lastLogTerm=" + this.lastLogTerm<a name="line.96"></a>
<span class="sourceLineNo">097</span>          + ",lastLogIndex=" + this.lastLogIndex<a name="line.97"></a>
<span class="sourceLineNo">098</span>          + "]";<a name="line.98"></a>
<span class="sourceLineNo">099</span>    }<a name="line.99"></a>
<span class="sourceLineNo">100</span>}<a name="line.100"></a>
<span class="sourceLineNo">101</span><a name="line.101"></a>




























































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